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E R Diagram
- 5. Mandatory, Many-to-Many INSTRUCTOR STUDENT INSTRUCTOR STUDENT
- 6. Optional, Many-to-Many DEPARTMENT STUDENT DEPARTMENT STUDENT
- 7. Optional/Mandatory, Many-to-Many INSTRUCTOR SKILL INSTRUCTOR SKILL
- 8. Optional/Mandatory, One-to-Many PRODUCT VENDOR PRODUCT VENDOR
- 9. Mandatory, One-to-One AUTOMOBILE ENGINE AUTOMOBILE ENGINE
- 10. Recursive EMPLOYEE supervises is supervised by
- 12. Resolving Many-to-Many Relationships SALES ORDERS INV. ITEMS SALES ORDERS INV. ITEMS ORDER ITEMS
- 13. Example (ER Diagram) SALES ORDERS INV. ITEMS ORDER ITEMS CLERKS CUSTOMERS